Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..187s&link_type=abstract
SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.
Astronomy and Astrophysics
Astrophysics
Scientific paper
Collisionless shock waves are observed in different regions of our universe. They are a good candidat for the formation of high energy particles through different processes like the well-known first/second Fermi processes. Such acceleration mechanisms are not alone and others can be observed when one takes into account the internal shock structure. As an example, we will focus on the impact of different processes on electron acceleration such as (a) shock front inhomogeneity, (b) shock front instationarity and (c) curvature effects of the shock front in the case of a supercritical quasi-perpendicular.
Numerical simulations allow us to observed precisely the time/space shock and the related evolution the particle dynamic. A two-dimensional electromagnetic full particle code is used in order to analyze electron self-consistently. It is shown that, for planar shock waves, bursts of energetic backstreaming electrons are formed in time by the shock reformation; in addition, these bursts are not uniform in space but are modulated by the shock rippling when electrons are reflected by the shock front. In addition, when the curvature effects are included, we observe the formation of backstreaming electrons which leads to the formation of "bump-in -tail" in the parallel distribution as we can divided in two different components: (i) a low parallel kinetic energy component (high percentage of electrons density) corresponding to mirrored electrons characterized by a loss-cone signature and (ii) a high parallel energy component (low percentage of electrons density) corresponding to backstreaming electrons characterized by a field aligned beam signature.
Lembège Bertrand
Savoini Philippe
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